Grinding-machine.



No; 812,122. PATENTED FEB. 6, 19'06.

R. D. FASSBTT. GRINDING MACHINE. APPLICATION FILED DE ATTORNEYJ'.

PATENTED FEB. 6, 1906.

R. D. FASSBTT. GRINDING MACHINE.

APPLICATION FILED DBO. 3. 1904- v 2 SHEETS-SHEET 2.

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' ATTORNEY'J UNITED STATES PATENT OFFICE.

RILEY D. FASSETT, OF DENVER, COLORADO, ASSIGNOR OF ONE-HALF TO WILLIAMH. NEFF, OF DENVER, COLORADO.

GRINDING-MACHINE.

Specification of Letters Patent.

Patented Feb. 6, 1906.

' Application filed December 3, 1904. Serial No. 235,374.

T 0 a. whom, it may concern.-

Be it know'n'that I, RILEY D. FASSETT, a citizen of the United States,residing at Denver, in the county of Denver and State of (.olorado, haveinvented certain new and useful Improvements in GrindingMachines; and Ido hereby declare the followin'g to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to whichit appertains to make and use the same.

My invention relates to grinding-machines, and moreparticularly to amachine of this character which is adapted for grinding mica.

The object of the invention is to provide a simple, durable, and compactmachine having a series of grinding devices which are so constructed andproportioned as to subject the material fed to the machine to successivegrinding operations, each of which reduces the size of the particles.

A further object'is to provide a casing of novel construction containinga series of detachable boxes having grinding-surfaces each of which isformed of a series of ribs of peculiar form. I

With the above and other objects in view the invention consists incertain other novel,

features and combinations of parts, as will be hereinafter fullydescribed and claimed.

In the accompanying drawings, Figure 1 is a side elevation ofthe'complete machine. Fig. 2 is an end elevation thereof. Fig. 3 is acentral horizontal section through the casing and the grinding mechanismcontained therein. Fig. 4 is a section on line A B, Fig. 3. Fig. 5 is asection on line B C, Fig. 3; and Fig. 6 is a section on line C D, Fig.3.

Referring to the figures by numerals of reference, 1 1 are standardswhich support a base 2, on which is fixedly mounted the casing of myimproved grinder. This casing comprises a lower section 3 and'an uppersection 4, each of which is preferably semicylindrical in form. The twosections are secured together along one side by means of hinges 5, andlever-locks 6 are pivoted to opposite portions of the upper section 4 ofthe casing and engage lugs 7 on'the lower section 3. These levers areemployed for thepurpose of draw ing the two casing-sections tightlytogether and locking them-in such position. The levers may beconstructed in any preferred manner but each is preferably. formed of aof the grinding-machine.

link 8, which is pivoted at one end to an ear 9 on section 4 and has acam 10 pivoted in the other end of the link. This cam will engage thelower surface of its lug? and when turned in one direction will bearagainst the lug and draw the two sections of the casing tightlytogether. I

A shaft 11 is rotatably mounted within the ends of the casing and theportions of the sections 3 and4which immediately surround is agrinding-wheel 16, comprising a hub 17' and an end disk 18. Extendingfrom the hub are curved blades 19, which are secured to or formed withthe disk 18 at one end- 'The opposite edges of the blades 19 areconnected by a ring 20,which serves in addition to the disk 18, to keepthe blades properly spaced apart at all times during the operation Disk18 is positioned against the inlet end of the casing of the machine. Aseries of similar grindingwheels or beaters 21 is located on the shaft,

and each of these wheels is also formed of a hub 22, a disk 23, and aseries of curved blades 24, the edges of said blades which are farthestremoved from the disks 23 being connected and braced by rings 25. Thegrind ing-Wheels 21 are arranged in a position the reverse to that ofWheel 16, and their blades 24 are also curved in a direction opposite tothe blades 19. Moreover, each grindingwheel 21 has an intermediate blade26 located between the outer edges of every two blades 24, and theseintermediate blades are secured to the disks 23 and rings 25 and areheld firmly in position thereby. A fan 27 is secured to and rotates'withshaft 11. and is formed 'of a hub 28, a disk 29, and curvedblades30. Thedisk 29 adjoins the inlet end of the casing, and blades 30 are curved ina direction opposite to the blades of the first grinding-wheel 16. Itwill of course be understood that all of the grinding-wheels and formedbetween the fan move the same direction and at the same speed.

Each grinding-wheel of the machine is surrounded by a box of novelconstruction. These boxes form separate grinding-compartments, and eachof them consists of two sections which are fitted within the respectivesections 3 and 4 of the casing and are held firmly in' position when the,casing' is closed. The box 31, which incloses wheel 16, has an inlet32. The inner face of ring 31 is eccentric to the center of said ringandv has a series of pockets 33 formed therein, the walls of saidpockets converging, so as to form substantially dovetail grooves, Ribs34 are the pockets by the converging walls thereof and form agrinding-surface over which thematerial whichis fed to the machine isadapted to be drawn by the blades 19. As hereinbefore stated, the innersurface of box 31 is eccentrically arranged, it

being at a constantly-varying distance from the grinding-wheel andhaving its inlet 32 where the said surface is farthest from the wheel.Each of the grinding wheels or heaters 21 is inclos'ed by a box 35,which is considerably wider than the wheel surrounded by it. Each box 35has peripheral pockets 36 formed therein. Each pocket is of a varyingdepth which diminis es from the center of the pocket toward the outletend thereof. The walls of the pockets 36 are inclined inwardly towardeach other, as clearly shown in Fig. 5, and produceribs 37, whichconstitute the gri ding-face of the box. The working edges of these ribsare curved to conform with the corresponding edges of the blades of thegrindin -wheel. All of the boxes 35 are practicalIy the same, with theexception of the ribs thereof, which increase.

in size, so that the ribs in the box adjoining box 31 are fartherremoved from their grinding-wheel than are the ribs in the end box35 ofthe series. Box 38 incloses the fan 27 and is interposed between the endbox 35 and the outlet end of the casing. 'The inner surface of box 38 iseccentric to the center of the fan,

and the distance of said surface from the fan gradually increases fromthe lower side of an outlet 39 around the fan to the opposite side ofsaid outlet. 7 A hopper 40 is arranged above the inlet 32 and on section4 of the casing, and an outlet-spout 41 extends from outlet 39.

When the material to be ground is placed within'the hopper 40, it wilfall .by gravity throu h the inlet 32 and into the largest portion 0 thepassage formed between wheel 16 and the innersurface of box 31. It willbe engaged by the curvdblades 19 and carried around the wheel 16 anddrawn to the center thereof. It will then be dischar ed into theadjoining box 35, where the blacfes 24 of the grinding-wheel in said boxwill throw the ma-' terial by centrifugal force against the ribs 37between and partially grind it. The material is then subjectedto'further grinding by being forced into the next box 35, where it isacted upon a j by the wheel 21 therein, and as the distance this wheeland the ribs 37 surrounding it is less than that between the first Wheel21 and its surrounding ribs it will be seen that the material will beground to a greater degree' of fineness. This operation is continued asthe material passes from the inlet td'the outlet end of the machine, andafter it has been reduced to a desired condition it is forced from theend box 35 into the box inclosing the fan 27. This fan throws thematerial. through the outlet 39 and spout 41.

It will be noticed that the ends of the blades 19 and 24 are curved andthat the ribs are also curved to correspond therewith. A waved passageis thus formed from one end to the other of the casing by the ribs. ofthe boxes, and the machine is therefore rendered very effective inbreaking u fiat scaly substances which Would natural y slip over a fiatsurface without being reduced in size.

By. constructing the machine in the man'- ner herein described wear andtear upon-the box are reduced to the minimum, because the process ofgrinding is gradual and none of the parts are subjected to any unduestrain. The casing can be readily opened by removin the caps 13 from thebosses 12 and by unlodidiig the upper section 4. After theiopening ofthe casing one or more of the box-sections can be detached and replaced,and access may also be readily had to the grindingwheels for the purposeof cleaning or repairing them.

n the foregoing description I have shown the preferred form of myinvention; but I do not 'mit myself thereto, as I am aware thatvmodifications may be made therein without departing from the spirit orsacrificing the advantages thereof, and I therefore reserve the right tomake such changes as fairly fall within the scope of my invention. I

Having now described my invention, what IIO I-claim as new, and desireto secure byLetters Patent, is r 1. In a machine of the characterdescribed,

the combination with a series of. rotatable beaters, of a series ofstationaryboxes surrounding said'beaters and forminggrindingcoinpartments, the internal diameters of sald boxes diminishingfrom one end toward the other of said series, the external diameter ofall of said boxes being equal, and each box having a series of pocketstherein formed by integral ribs therebetween.

2. In'a machine\of the character described, the combination with aseries of rotatable beaters, of a series of stationary boxes surroundingsaid beaters and forming grindingcompartments, the internal diameters ofsaid boxes diminishing from one end toward the other of said series, andeach of said boxes having aseries of pockets therein, each pocket beingof varying depth.

3. In a machine of the character described, the combination with aseriesof rotatable heaters, of a series of stationary boxes surroundingsaid heaters and forming grindingcompartments, the internal diameters ofsaid boxes diminishing from one end toward the other of said series, andeach box having a series of peripheral pockets therein forming ribstherebetween, each pocket having converg ing walls and being of varyingdepth.

4. In a machine of the character described, the combination with aseries of heaters each comprising similarly-curved blades hav ngirregular ends; of a series of stationary boxes surrounding the heatersand forming communicating grinding-compartments of different diameters,each box conforming 'in contour to the ends of the blades and havingpockets therein.

5. In a machine of the character described, the combination with aseries of rotatable heaters each comprising a hub, similarlycurvedblades extending therefrom and having irregular ends, and means forconnecting the blades at opposite edges of a series of stationary boxessurrounding the heaters and forming grinding-compartments of difi erentdiameters, the inner surface of each box conforming in contour to theends of the blades therein and having pockets forming ribs therebetween.

6. In a machine of the character described, the combination with a casinof a series of rotatable heaters therein, eacIl comprising a hub,similarly-curved blades extending therefrom and having irregular ends,and bracing means connecting the opposite edges of the blades, sectionalboxes within the casing and surrounding the heaters, said boxes forminggrinding-compartments and each box having an irregular working faceconforming in contourto the ends of the blades.

7. In a machine of the character described, the combination with. acasing comprising sections movably connected; of a series of rotatableheaters within the casing and each comprising a hub, similarly-curvedblades,

and bracing means connecting the edges of' the blades, sectional boxeswithin the casing and surrounding the heaters, said boxes forminggrmdlng-compartments of different diameters and having irregular innerfaces conforming to thecontour' of the ends of the blades.

8. In a machine of the character described, the combination with acasing having an inlet and an outlet, of a series of rotatable heatersW] thin the casing, and each comprising a hub, similarly-curved bladesand strengthening devices connecting the edges of blades, meansrotatable with the heaters for forcing material into engagementtherewith, a discharge device within the casing having blades curved ina direction opposite to the blades of the heaters and a series ofsectional boxes within the casing and surrounding the rotatable devicestherein.

9. In a machine of the character described, the combination with asectional casing, and means for securing the same in closed position; ofa series of heaters rotatably mounted within the casing and eachcomprising a hub similarly-curved blades having irregular working endsand bracing means connecting the blades, a series of sectional boxeswithin the casing and surrounding the beaters, said boxes havingirregular working faces conforming in contour to the ends of the bladestherein, means for forcing material into the boxes at one end and havingblades curved in a direction opposite to those of the heaters, and adischarge device rotatably mounted within the casing.

10. In a machine of the character described, the combination with asectional casing having an inlet and an outlet, and means for securingthe same in closed position, of a shaft rotatably mounted in the easing,a series of rotatable heaters secured upon the shaft and each comprisinga hub, blades having irregular Working ends and bracing devicesconnecting the blades, a series of sectional boxes Within the casing andsurrounding the heaters, each of said boxes having an irregular workingface conforming in contour to the ends of the blades, rotatable meansadj acent the inlet for forcing material into the boxes, and a rotatabledischarge device adjacent the outlet.

11. In a machine of the character described, the combination with acasing having an inlet and an outlet; of a rotatable shaft within thecasing, a series of sectional boxes Within the casing and forminggrindingcompartments of different diameters, each of said boxes havingan irregular Working face, and end boxes within the casing and ad acentthe inlet and outlet, each of said end boxes having an eccentric Workingface, a rotatable device within the inlet-box for forcing material intothe adjoining boxes, a rotatable discharge device in the outlet-box, anda series of rotatable grinding devices in the grmdmgcompartments.

12. In a machine of the character described, the combination with acasing having .an inlet and an outlet, a box within the casing andadjacent the inlet, said box hav; ingan eccentric working face, arotatable feeding device Within said box for drawing material throughthe inlet, said device comprising a hub and curved blades extendingtherefrom, a series of'rotatable heaters within the casing eachcomprising a hub andsimilar blades curved in a direction opposite tothose on the feeding device, sectional boxes within the casing andsurrounding the beaters, said boxes being of different internal d1- tothe other thereof, and ribs ameters and having irregular working facesand rotatable means for discharging material through the outlet.

13. In a machine of the character described, the con'rbination with aseries of rotatable beaters having blades with curved ends; of a seriesof stationary ribs surrounding each of said beaters to form agrindingchamber, said ribs conforming in contour to the ends of theblades and forming a continu ous passage with waved walls.

14. In a machine of the character described, the combination with aseries of rotatable beaters, having blades with curved ends; of a seriesof stationary ribs surrounding each of said beaters and conforming incontour to the ends of the blades, the series of ribs forming a passagehaving waved walls.

15. In a machine of the character described, the combination with arotatable beater; of a stationary box surrounding the beater havingribs, said ribs forming pockets in the inner surfaceof said box, saidpockets having overhanging walls.

16. In a machine of the characterv described, the combination with aseries of rotatable beaters having blades with curved ends, of a seriesof stationary boxes surrounding the beaters, said boxes being ofdifierent internal diameters and forming a continuous passagediminishing in diameter from one end integral with the inner surfaces ofthe boxes, and conforming in contour with the ends of the blades,

said ribs forming pockets therebetween of varying de ths, said pocketshaving overhangin wa ls. Y

17. a mechanism of the class described, the combination of a'sectionalcasing, each section of said casing provided with a semicylindrical endportion, caps positionedupon the semicylindrical endportlonsof saidsections, and grinding means positioned within said casing.

18. In a mechanism of the class described,

beater positioned within said casing, said beater comprising a hub,similarly-curved blades extending from said hub, spacing means engagingsaid blades, and an intermethe combination with a casing, of a rotatablediate short blade carried by said spacing means and positioned betweeneach two of i said similarly-curved blades.

19. In a mechanism of the class described, the combination with acasing, of arotatable beater positioned within said casin said beatercomprising a hub provided wit similarly-curved blades, spacing meansengaging one side of each of said blades, and an intermediate bladepositioned between each two of said similarly-curved bladesand engagingsaid spacing means.

In testimony whereof I afiix my signature witnesses.

in presence of two RILEY D. FASSETT. Witnesses:

C. E. SMEDLEY,

CARLE WHITEHEAD.

